I am interested in LinkMachine's SEO and link analysis features, but I will not be using LinkMachine to exchange links. Can I purchase an upgrade that only includes the SEO features?

Yes, you can upgrade your LinkMachine account to LinkMachine SEO which includes the advanced SEO features but not the advanced link exchange features (which are in the LinkMachine Premium upgrade). The LinkMachine SEO upgrade costs $89.95 and may be purchased after LinkMachine is installed, by selecting Upgrade from the Go To... menu on your LinkMachine admin page.